/* =========================================================
   AI TEACHING TOOLKIT — Futuristic design system
   Theme: deep space dark, aurora gradients, glass, neon edges
   ========================================================= */
:root {
  --bg: #05060e;
  --bg-2: #090b18;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.06);
  --stroke: rgba(255, 255, 255, 0.09);
  --stroke-strong: rgba(255, 255, 255, 0.18);

  --text: #eef0ff;
  --text-soft: #a3a8c9;
  --text-dim: #6f7398;

  --cyan: #34e7e4;
  --violet: #8b5cf6;
  --pink: # f472b6;
  --pink: #f472b6;
  --blue: #4f8cff;
  --lime: #9bff6b;

  --grad-primary: linear-gradient(120deg, #34e7e4 0%, #4f8cff 45%, #8b5cf6 100%);
  --grad-soft: linear-gradient(120deg, rgba(52,231,228,0.18), rgba(139,92,246,0.18));
  --grad-text: linear-gradient(100deg, #5ff0ee 0%, #7aa8ff 50%, #b78bff 100%);

  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius: 18px;
  --radius-sm: 12px;
  --shadow-glow: 0 0 0 1px rgba(255,255,255,0.05), 0 18px 50px -12px rgba(79,140,255,0.25);
  --shadow-card: 0 24px 60px -28px rgba(0,0,0,0.8);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16.5px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Ambient animated background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(700px circle at 12% 8%, rgba(52,231,228,0.10), transparent 55%),
    radial-gradient(800px circle at 88% 18%, rgba(139,92,246,0.14), transparent 55%),
    radial-gradient(700px circle at 50% 100%, rgba(79,140,255,0.10), transparent 60%),
    var(--bg);
}
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(circle at 50% 30%, black, transparent 80%);
  -webkit-mask-image: radial-gradient(circle at 50% 30%, black, transparent 80%);
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 26px; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--text);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.grad-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 9px;
}

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background .3s ease, border-color .3s ease, padding .3s ease;
  border-bottom: 1px solid transparent;
}
.navbar.scrolled {
  background: rgba(5, 6, 14, 0.72);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid var(--stroke);
}
.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.nav-brand {
  display: flex; align-items: center; gap: 11px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.02em;
}
.nav-brand .nb-mark {
  width: 34px; height: 34px;
  background: var(--grad-primary);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: #05060e;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  box-shadow: 0 6px 18px -4px rgba(79,140,255,0.6);
}

.nav-links { display: flex; gap: 30px; align-items: center; }
.nav-links a {
  font-size: 14.5px;
  color: var(--text-soft);
  font-weight: 500;
  position: relative;
  padding: 4px 0;
  transition: color .2s ease;
}
.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: var(--text); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: -5px; left: 0; right: 0; height: 2px;
  background: var(--grad-primary);
  border-radius: 2px;
}
.nav-cta {
  background: var(--surface-2);
  border: 1px solid var(--stroke-strong);
  color: var(--text) !important;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 13.5px !important;
  font-weight: 600 !important;
  white-space: nowrap;
  transition: all .2s ease;
}
.nav-cta:hover {
  border-color: var(--cyan);
  box-shadow: 0 0 18px -4px rgba(52,231,228,0.6);
  transform: translateY(-1px);
}
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 6px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: .2s; }

/* ===== HERO ===== */
.hero { position: relative; padding: 170px 0 120px; overflow: hidden; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 60px;
  align-items: center;
  position: relative;
}
.hero-eyebrow-row { margin-bottom: 26px; }
.eyebrow.pill {
  background: var(--surface);
  border: 1px solid var(--stroke);
  padding: 8px 16px;
  border-radius: 999px;
  backdrop-filter: blur(8px);
}
.hero h1 {
  font-size: 58px;
  margin-bottom: 24px;
  line-height: 1.04;
}
.hero h1 em { font-style: normal; }

.hero-sub {
  font-size: 18.5px;
  color: var(--text-soft);
  max-width: 540px;
  margin-bottom: 38px;
}
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; margin-bottom: 40px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 15px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.btn-primary {
  background: var(--grad-primary);
  color: #05060e;
  box-shadow: 0 14px 40px -12px rgba(79,140,255,0.7);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 20px 50px -10px rgba(79,140,255,0.9); }
.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--stroke-strong);
  backdrop-filter: blur(8px);
}
.btn-secondary:hover { border-color: var(--cyan); transform: translateY(-2px); box-shadow: 0 0 24px -6px rgba(52,231,228,0.6); }

.hero-meta { display: flex; gap: 26px; flex-wrap: wrap; font-size: 13.5px; color: var(--text-soft); }
.hero-meta span { display: flex; align-items: center; gap: 8px; font-weight: 500; }
.hero-meta i { color: var(--cyan); font-size: 13px; }

/* Hero visual — floating glass cards */
.hero-visual { position: relative; height: 460px; }
.demo-card {
  position: absolute;
  width: 320px;
  background: linear-gradient(160deg, rgba(255,255,255,0.07), rgba(255,255,255,0.02));
  border-radius: var(--radius);
  border: 1px solid var(--stroke);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 22px 24px;
  box-shadow: var(--shadow-card);
}
.demo-card.card-1 { top: 0; right: 20px; z-index: 3; animation: float1 7s ease-in-out infinite; }
.demo-card.card-2 { top: 130px; right: 100px; z-index: 2; opacity: 0.92; animation: float2 8s ease-in-out infinite; }
.demo-card.card-3 { top: 260px; right: 0; z-index: 1; opacity: 0.8; animation: float1 9s ease-in-out infinite reverse; }
@keyframes float1 { 0%,100% { transform: translateY(0) rotate(-1.5deg); } 50% { transform: translateY(-14px) rotate(-1.5deg); } }
@keyframes float2 { 0%,100% { transform: translateY(0) rotate(2.5deg); } 50% { transform: translateY(-18px) rotate(2.5deg); } }

.demo-card .dc-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
  font-weight: 500;
}
.demo-card .dc-title { font-family: var(--font-display); font-weight: 600; font-size: 17px; margin-bottom: 8px; }
.demo-card .dc-body { font-size: 13px; color: var(--text-soft); }
.demo-card .dc-tag {
  display: inline-block;
  margin-top: 14px;
  background: var(--grad-soft);
  border: 1px solid var(--stroke);
  color: var(--cyan);
  font-size: 10.5px;
  font-weight: 600;
  font-family: var(--font-mono);
  padding: 4px 11px;
  border-radius: 999px;
}

/* ===== SECTIONS ===== */
section { padding: 110px 0; position: relative; }
.section-head { max-width: 720px; margin-bottom: 58px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: 40px; margin: 16px 0; }
.section-head p { color: var(--text-soft); font-size: 17px; }

/* ===== HOW IT WORKS ===== */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.glass-card {
  background: linear-gradient(160deg, rgba(255,255,255,0.06), rgba(255,255,255,0.015));
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.glass-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: var(--grad-primary);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity .25s ease;
  pointer-events: none;
}
.glass-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-glow); }
.glass-card:hover::before { opacity: .5; }

.step-card { padding: 32px 28px; }
.step-num {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: #05060e;
  background: var(--grad-primary);
  width: 42px; height: 42px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
  box-shadow: 0 8px 22px -8px rgba(79,140,255,0.8);
}
.step-card h3 { font-size: 19px; margin-bottom: 9px; }
.step-card p { color: var(--text-soft); font-size: 14.5px; }

/* ===== PROMPT TEMPLATES ===== */
.filter-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 40px; }
.filter-chip {
  padding: 9px 18px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: var(--surface);
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text-soft);
  transition: all .2s ease;
}
.filter-chip:hover { border-color: var(--stroke-strong); color: var(--text); }
.filter-chip.active {
  background: var(--grad-primary);
  border-color: transparent;
  color: #05060e;
  font-weight: 600;
}

.prompt-card {
  background: linear-gradient(160deg, rgba(255,255,255,0.05), rgba(255,255,255,0.015));
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  margin-bottom: 18px;
  overflow: hidden;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.prompt-card.expanded { border-color: var(--stroke-strong); box-shadow: var(--shadow-glow); }
.prompt-card.hidden-card { display: none; }

.pc-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 26px 28px; cursor: pointer; transition: background .2s; }
.pc-head:hover { background: rgba(255,255,255,0.02); }
.pc-left { display: flex; gap: 20px; align-items: center; }
.pc-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  width: 44px; flex-shrink: 0;
}
.pc-badges { display: flex; gap: 8px; margin-bottom: 8px; flex-wrap: wrap; }
.badge {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 7px;
  background: var(--surface-2);
  border: 1px solid var(--stroke);
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.badge.level { background: var(--grad-soft); color: var(--cyan); border-color: rgba(52,231,228,0.25); }
.pc-title { font-size: 21px; margin-bottom: 5px; }
.pc-desc { font-size: 14.5px; color: var(--text-soft); max-width: 640px; }

.pc-chevron {
  flex-shrink: 0;
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--stroke);
  background: var(--surface);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-soft);
  transition: transform .3s ease, background .2s, color .2s;
}
.prompt-card.expanded .pc-chevron { transform: rotate(180deg); background: var(--grad-primary); color: #05060e; border-color: transparent; }

.pc-body { max-height: 0; overflow: hidden; transition: max-height .4s ease; }
.prompt-card.expanded .pc-body { max-height: 4200px; }

.pc-tabs { display: flex; gap: 4px; padding: 0 28px; border-bottom: 1px solid var(--stroke); }
.pc-tab {
  padding: 13px 16px;
  font-size: 13.5px;
  font-weight: 600;
  font-family: var(--font-display);
  color: var(--text-dim);
  border-bottom: 2px solid transparent;
  position: relative; top: 1px;
  transition: color .2s;
}
.pc-tab:hover { color: var(--text-soft); }
.pc-tab.active { color: var(--text); border-bottom-color: var(--cyan); }

.pc-panel { display: none; padding: 24px 28px 30px; }
.pc-panel.active { display: block; }

.prompt-box {
  background: #04050c;
  border: 1px solid var(--stroke);
  color: #c7cdf0;
  border-radius: var(--radius-sm);
  padding: 22px 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.75;
  white-space: pre-wrap;
  position: relative;
}
.prompt-box .var { color: var(--cyan); font-weight: 600; }

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--grad-primary);
  color: #05060e;
  font-weight: 600;
  font-size: 13.5px;
  font-family: var(--font-display);
  padding: 11px 18px;
  border-radius: 10px;
  margin-top: 16px;
  transition: transform .15s ease, box-shadow .2s ease, filter .2s;
}
.copy-btn:hover { box-shadow: 0 10px 30px -10px rgba(79,140,255,0.7); filter: brightness(1.08); }
.copy-btn:active { transform: scale(0.97); }
.copy-btn.copied { background: var(--lime); }
.copy-btn.ghost { background: var(--surface-2); border: 1px solid var(--stroke-strong); color: var(--text); }
.copy-btn.ghost:hover { border-color: var(--cyan); box-shadow: 0 0 18px -6px rgba(52,231,228,0.6); }

.output-md { font-size: 14.5px; color: var(--text-soft); }
.output-md h4 { font-size: 16.5px; margin: 18px 0 10px; color: var(--text); }
.output-md p { margin-bottom: 11px; }
.output-md em { color: var(--cyan); font-style: normal; }
.output-md table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 13px; }
.output-md th, .output-md td { border: 1px solid var(--stroke); padding: 9px 11px; text-align: left; }
.output-md th { background: var(--surface-2); font-weight: 600; color: var(--text); }
.output-md ul, .output-md ol { margin: 8px 0 12px 20px; }
.output-md li { margin-bottom: 5px; }
.output-md strong { color: var(--text); font-weight: 600; }

.rationale-note {
  background: var(--grad-soft);
  border: 1px solid var(--stroke);
  border-left: 3px solid var(--cyan);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 18px;
  font-size: 14px;
  color: var(--text-soft);
}
.rationale-note strong { color: var(--text); }

/* ===== TOOLS ===== */
.tools-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; align-items: start; }
.tool-card { padding: 30px 28px; }
.tool-icon {
  width: 50px; height: 50px;
  border-radius: 14px;
  background: var(--grad-soft);
  border: 1px solid var(--stroke);
  color: var(--cyan);
  font-size: 20px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
}
.tool-card h3 { font-size: 19px; margin-bottom: 9px; }
.tool-card p { color: var(--text-soft); font-size: 14px; margin-bottom: 18px; }

.cefr-tool { display: none; margin-top: 16px; }
.cefr-tool.active { display: block; }
.cefr-q { font-size: 14px; font-weight: 600; margin-bottom: 12px; color: var(--text); }
.cefr-options { display: flex; flex-direction: column; gap: 9px; margin-bottom: 16px; }
.cefr-opt {
  text-align: left;
  padding: 11px 15px;
  border: 1px solid var(--stroke);
  background: var(--surface);
  color: var(--text-soft);
  border-radius: 10px;
  font-size: 13.5px;
  transition: all .15s ease;
}
.cefr-opt:hover { border-color: var(--cyan); background: var(--surface-2); color: var(--text); }
.cefr-result {
  display: none;
  background: var(--grad-soft);
  border: 1px solid var(--stroke);
  color: var(--text-soft);
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
}
.cefr-result.show { display: block; }
.cefr-result .lvl {
  font-family: var(--font-display); font-size: 30px; font-weight: 700;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent;
  margin: 4px 0;
}
.cefr-restart { font-size: 13px; font-weight: 600; color: var(--cyan); margin-top: 12px; display: inline-block; text-decoration: underline; }

.pcz-field { margin-bottom: 14px; }
.pcz-field label { font-size: 12.5px; font-weight: 600; display: block; margin-bottom: 6px; color: var(--text-soft); }
.pcz-field select, .pcz-field input {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--stroke);
  border-radius: 10px;
  font-size: 14px;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
}
.pcz-field select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a3a8c9' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 34px; }
.pcz-field select option { background: #0b0d1c; color: var(--text); }
.pcz-field select:focus, .pcz-field input:focus { border-color: var(--cyan); }
.pcz-field input::placeholder { color: var(--text-dim); }
.pcz-output {
  margin-top: 16px;
  background: #04050c;
  border: 1px solid var(--stroke);
  color: #c7cdf0;
  padding: 16px;
  border-radius: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  white-space: pre-wrap;
  max-height: 180px;
  overflow-y: auto;
}

.guide-list { list-style: none; margin-bottom: 20px; }
.guide-list li { display: flex; gap: 10px; font-size: 13.5px; color: var(--text-soft); margin-bottom: 9px; align-items: flex-start; }
.guide-list i { color: var(--cyan); font-size: 14px; flex-shrink: 0; margin-top: 3px; }

/* ===== FEEDBACK ===== */
.feedback-wrap { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 44px; align-items: start; }
.feedback-form { padding: 30px; position: sticky; top: 100px; }
.feedback-form h3 { font-size: 20px; margin-bottom: 7px; }
.feedback-form > p { font-size: 14px; color: var(--text-soft); margin-bottom: 20px; }
.fb-field { margin-bottom: 15px; }
.fb-field label { font-size: 12.5px; font-weight: 600; display: block; margin-bottom: 6px; color: var(--text-soft); }
.fb-field input, .fb-field textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--stroke);
  border-radius: 10px;
  font-size: 14px;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
  resize: vertical;
}
.fb-field input:focus, .fb-field textarea:focus { border-color: var(--cyan); }
.fb-field input::placeholder, .fb-field textarea::placeholder { color: var(--text-dim); }
.fb-stars { display: flex; gap: 7px; margin-bottom: 4px; }
.fb-star { font-size: 28px; color: var(--stroke-strong); transition: color .12s ease, transform .1s ease; line-height: 1; }
.fb-star:hover, .fb-star.active { color: var(--cyan); transform: scale(1.1); text-shadow: 0 0 14px rgba(52,231,228,0.7); }
.fb-submit-msg { font-size: 13.5px; margin-top: 12px; display: none; }
.fb-submit-msg.show { display: block; }
.fb-submit-msg.success { color: var(--lime); font-weight: 600; }
.fb-submit-msg.error { color: #ff6b81; font-weight: 600; }

.comments-list { display: flex; flex-direction: column; gap: 16px; }
.comment-card { padding: 22px 24px; }
.comment-top { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 8px; gap: 12px; }
.comment-author { display: flex; align-items: center; gap: 12px; }
.comment-avatar {
  width: 42px; height: 42px;
  border-radius: 50%;
  background: var(--grad-primary);
  color: #05060e;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}
.comment-name { font-weight: 600; font-size: 14.5px; color: var(--text); }
.comment-role { font-size: 12.5px; color: var(--text-dim); }
.comment-stars { color: var(--cyan); font-size: 14px; flex-shrink: 0; white-space: nowrap; letter-spacing: 1px; }
.comment-text { font-size: 14.5px; color: var(--text-soft); margin-top: 8px; }
.comment-date { font-size: 12px; color: var(--text-dim); margin-top: 10px; font-family: var(--font-mono); }
.comments-empty, .comments-loading { text-align: center; padding: 48px 20px; color: var(--text-dim); font-size: 14.5px; }

/* ===== ABOUT ===== */
.about-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 54px; align-items: center; }
.about-avatar {
  width: 100px; height: 100px;
  border-radius: 26px;
  background: var(--grad-primary);
  color: #05060e;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 38px;
  margin-bottom: 22px;
  box-shadow: 0 16px 40px -14px rgba(79,140,255,0.8);
}
.about-grid h2 { font-size: 32px; margin-bottom: 16px; }
.about-grid > div > p { color: var(--text-soft); margin-bottom: 18px; }
.about-skills { display: flex; gap: 10px; flex-wrap: wrap; margin: 20px 0 28px; }
.skill-pill {
  background: var(--surface);
  border: 1px solid var(--stroke);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-soft);
}
.stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.stat-box { padding: 26px; text-align: center; }
.stat-num {
  font-family: var(--font-display); font-size: 38px; font-weight: 700;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat-label { font-size: 12.5px; color: var(--text-soft); margin-top: 6px; }

/* ===== FOOTER ===== */
footer {
  border-top: 1px solid var(--stroke);
  background: rgba(5,6,14,0.6);
  padding: 50px 0;
  text-align: center;
  font-size: 14px;
  color: var(--text-soft);
}
footer strong { color: var(--text); font-weight: 600; }

/* ===== FLOATING UI ===== */
.back-to-top {
  position: fixed;
  bottom: 28px; right: 28px;
  width: 50px; height: 50px;
  border-radius: 50%;
  background: var(--surface-2);
  border: 1px solid var(--stroke-strong);
  backdrop-filter: blur(10px);
  color: var(--text);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transform: translateY(10px);
  transition: all .25s ease;
  z-index: 90;
}
.back-to-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top:hover { border-color: var(--cyan); box-shadow: 0 0 20px -6px rgba(52,231,228,0.7); }

.toast {
  position: fixed;
  bottom: 28px; left: 28px;
  background: rgba(9,11,24,0.92);
  border: 1px solid var(--stroke-strong);
  backdrop-filter: blur(14px);
  color: var(--text);
  padding: 15px 22px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-card);
  z-index: 200;
  opacity: 0; transform: translateY(10px);
  transition: all .25s ease;
  pointer-events: none;
  display: flex; align-items: center; gap: 11px;
  max-width: 360px;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast i { color: var(--cyan); }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ===== RESPONSIVE ===== */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { height: 340px; margin-top: 24px; }
  .demo-card { width: 270px; }
  .steps { grid-template-columns: 1fr; }
  .tools-grid { grid-template-columns: 1fr; }
  .feedback-wrap { grid-template-columns: 1fr; }
  .feedback-form { position: static; }
  .about-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-links.mobile-open {
    display: flex;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: rgba(5,6,14,0.96);
    backdrop-filter: blur(18px);
    flex-direction: column;
    padding: 22px 26px 26px;
    border-bottom: 1px solid var(--stroke);
    gap: 18px;
  }
  .nav-toggle { display: flex; }
  .hero { padding: 130px 0 80px; }
  .hero h1 { font-size: 38px; }
  .hero-sub { font-size: 16px; }
  section { padding: 72px 0; }
  .section-head h2 { font-size: 29px; }
  .pc-left { gap: 14px; }
  .pc-title { font-size: 18px; }
  .pc-head { padding: 20px; }
  .pc-tabs { padding: 0 20px; overflow-x: auto; }
  .pc-panel { padding: 20px; }
}